Safety guaed foe



T. A. BRYSON SAFETY GUARD FOR GENTRIFUGAL MACHINES Nov. 24, 1931. Re.18,254

Original Fil ed April 10, 1925 3 Sheets-Sheet 1 .IN VEN TOR I A2TORNEY'r. A. BRYSON Nov. 24, 1931.

IN VEN TOR A TTORNE Y T A. BRYSON SAFETY GUARD FOR CENTRIFUGAL MACHINESOriginal Filed April 10, 1923 3 Sheets-Sheer 3 ltf Reissued Nov; 24,1931 UNITED STATES. PATENT OFFICE TANDY A. BRYSON, or 'rnoy, NEW YORK,ASSIGNOR To T'OLHURST. MACHINE WORKS, A.

CORPORATION 01:! NEW YGRK SAFETY GUARD FOR CENTRIFUGAL MACHINES OriginalNo. 1,649,947, dated November 22, 1927, Serial No. 631,063,!110311 April10, 1923. Application for reissue filed August 22,1929. Serial No.387,774.

The invention relates to: safety guards for centrifugal machines, andmore particularly to a novel and greatly improved form of such guardswhich automatically preventsherein and constituting a part hereof, il-

lustrate one embodiment of the invention, and together with thedescription, serve to explain the principles of the invention.

("If the drawings Fig. 1 is a top plan, with parts in section of amechanism embodying the invention;

Fig. 2 is a side elevation looking at Fig. 1 from the left;

Fig. 3 is a, detached detail of the hinges of the basket closure;

Fig. 4 is a fragmentary vertical section, greatly enlarged. takensubstantially on line 4-4 of'Fig. 1, looking in the direction of thearrows;

Fig. 5 is a horizontal section, taken substantially on line 5-5 of Fig.4, looking in the direction of the arrows;

Figs. 6, 7 and 8 are fragmentary views, showing different positions ofthe safety device and control. for the basket driving mechanism;

9 is a vertical central section of a modified form of the basket closurelocking and releasing device; and

Fig. 10 is a l ke view of another modified form of said device.

The invention is directed to provid ng a novel and useful safety guardfor centrifual machines, Which will necessarily compel the completeclosure of the basket closure or lid before the power can be applied tostart the; basket. rotating, and also will eifectively prevent theopening of the basket lid or closure before the basket has comecompletely to rest. In realizing this general object, theinven tionprovides locking means for the basket, lid or closure which are movableby an operative to perm-it the; opening of the lid or, closure,-afterthe basket has come to: rest, but. which returns automatically andimmediate ly to locking position as soon as released by the operativeafter the opening of the lid orclosure. In cooperation and conjunctiontherewith a mechanism is provided whereby the power may be turned on torotate the basket only when the basket lid or closure is in theclosedand locked position, this means being controlled directly from thebasket closure k j Referring now by way of example to the presentpreferred embodiment of the; invention, illustrated by way of example inthe accompanying drawings, a centrifugal machine of a substantiallystandard type or form is shown having a casing 1 within which is theusual basket (not shown). The basket is supported by and rotated by theshaft 2, which shaft is driven in a suitable manner, as by a pulley 3fast on the shaft. over which pulley runs a driving belt 4:. This shaftis carried in bearingsmounted upon the upper art o upright frame pieces5 and 6, the bases if and 8 of which. respectively, are bolted to andsupported by the top portion 9 of the casing 1. A standard 10 islikewisefixed to the top of the casing and extends upwardly to support the shaftbearing and also the belt pulleys and other parts. The upper parts ofthese supports are broken away as they con stitute per so no part of thepresent invert tion. This construction so far described is a well-knowntvpe of construction and need not lie-described in further detail.

The embodied form of safety lid or closure comprises two lids or halves21 and 22, the lid :2]. being hinged at 23 and 24, and turning up anddown on an axis passing through these hinges, the hinges being mountedeither directly or indirectly upon the topof the V casing. In likemanner the lid member 22 detent hooks 29. This form of casing closure isthe same as, or substantially similarto, that shown in my Patent No.1,160,373 dated November 16, 1915,although the invention in its broaderaspects is applicable to, other forms of centrifugal casings or basketclosures, and the present embodiment will not be'regarded as restrictiveof the invention. Referring now in detail to the embodied form of thelid or closure locking devices (Figs. 1 to 5), a sleeve 34 fits closelyabout the shaft 2 at the level of the top of the casing and somewhatthereabove. This sleeve is fixed to the shaft 2 to rotate therewith in asuitable manner as by clamping screws 35 which are screw-threaded intothe sleeve 34 and engage the shaft 2. A stop collar 36 is alsopreferably employed at the top of the sleeve, and this is likewise heldin position in suitable manner by the screw 35.

Loosely encircling the fixed sleeve 34 is a locking ring 37, which isslidable longitudinally of the sleeve. A flange 33 on sleeve 34 is abottom stop for ring 37 This ring has on its bottom portion an outwardlyand downwardlyextending conical skirt 38, beneath the bottom edge ofwhich a cooperating locking member, or members. on the casing 'lid orclosureengagesto lock the lid in closed position, On its inner surface,which is in slidinglengagement with the sleeve 34, the l ocking ring 37is provided with a helical groove 40.0f relatively very great pitch, andthis groove preferably terminates at its upper end in a locking notch41. A pin 42 is fixed in the sleeve 34 and works in the groove 40. As amatter of convenience, the locking ring 37 is preferably provided withboth a right-hand groove 40 and a left-hand groove 40, and the pin 42may be positioned in'either groove dependent upon the direction in whichthe basket and its shaft 2 are to be rotated.

'Mounted on each of the casing lids or closures 21 and 22 are suitablecooperating locking means, and as shown, a spring latch 60,

having a beveled nose" 61, is longitudinally reciprocably, mounted in anaperture in the front end of a casing 62 fastened to, and mounted'upon,the upper surface of the'corresponding lids 21 and 22.' The latch 60 hasextending from the rearward end thereof'a cylindrical pin 64, which isalso longitudinally reciprocably supported in an opening in the rearwall of the casing 62. A helical spring 65 is in compression between therear 38and thus be locked, the pin 42 in the re- 'cess'41 preventing theupward motion of the lockingring 37.

The manner of operation of the mechanism just described is substantiallyas follows The mechanism maybe regarded as in the full line position ofFig. 4, and the operative releases the lids 21 and 22 from their springcatches 29, and as they drop down, the latches 60 will lock the lidsbeneath the skirt, 38' of the locking ring as just described, and thepin 42 will hold the locking ring in its posi.-. tion; The closing ofthe lids will permit the turning on of the power and the rotation of thebasket and its shaft 2 by mechanism and in a manner which will be laterdescribed.

"After the drying or other vcentrifugal separating action is completed,it will be impossible for an operator to grasp the locking ring 37 andraise it to the broken line position of Fig. 4 (thereby to release andpermit the opening of the lids 21 and 22) until the shaft 2 hasabsolutely come to rest. That helical groove 40 in the locking ring isused so that the locking ring must turn in the direction of rotation ofthe shaft 2 when it is raised from locking to unlocking position. Whenthe basket shaft 21is 'moving,'any friction on the locking ring 37caused by an operative grasping the-locking ring tendsto causethe looing ring to rotate backwardly relatively to the basket shaft 2, and thedirection or position of the groove 40 causes a compelling downwardpressure on the ring 37, whereby it is firmly held down. Practical testshave shown it to be impossible to turn the locking ring in thedirectionof rotation of shaft 2 and at the same time to lift the ring, even whenthe shaft is rotating exceedingly slowly and is about to come to rest. 1I

The pitch or inclination of the groove 40, while suflicient to preventthe locking ring being raised until shaft 2 has come absolutely torest,is sufficiently steep to permit the looking ring to drop back ofits own weight to locking position, that is, from the broken lineposition to the solid line position of Fig. 2.. The acquired inertia atthe endof the drop is sufiicient to rotate the locking ring and bringthe pin 42 into the locking groove or pocket 41, so that the lockingring may not again be lifted on the shaft without at the same timerotating it, which can only be done when the shaft is at rest.

In Fig. 9 a modified form of the locking mechanism is'shown wherein asleeve 70 is fixed on the'shaft 2, this sleeve having a heavy helicalgroove or screw-thread 72 formed on the exteriorisur-face "thereof. Astop edl'lar end -0f-'the path of travel of the locking-device. Thelocking device in'thiscase consists of a cylinder '75, surroundingloosely the sleeve 70, the cylinder having an enlarged hollow lowerportion 7'6, the flat bottom face of which constitutes the latcheng-aging surface or device. A pawl '78 is withintheenlarged lowerportion 760 f the "cylinder or casing 75, t'h'epa-wl being pivotallysupported at '7 9 and acted upon by a spring '80, which impels itinwardly toward the shaftQ. The

upper endof the pawlconstitutes 'a-squ'are face 81 and the underside ofthe pawl consti- "tutes a bevel face 82. Spring pressed latche's 60carried by theclosure snap under the lower edge of portion 76 forholding the cover closed.

This mechanism operates in substantially the same manner as that of Fig.4. That is,

the groove or thread 01:72 is inclined so that by reason of thefrictional engagement of the square end 81 of pawl 78therewith, it "isnecessary to rotate the locking 'member'75 in the direction-of rotationof the shaft 2 to raise the locking member from the locking position ofFig. 9. VVh'en the operative grasps the locking member 75, if shaft 2 isrotating even slightly, the screw-thread thrusts the head 81 of the pawldownwardly and holds, or impelsthe member7'5 to locking thread 72 onsleeve '70. and the pawl is cammed backwardly, that is, radiallyeutwardly against the spring 80. The locking member 75 willimmediately-drop to the looking position of Fig. 9,whereu pon thepaWl7'8 will snap inwardly radially and its square head. 81 will lockbeneath the screwthread 7-2 of the sleeve '70.

InFig. 10 another modified form of the loekingmechanism is shown,wherein a collar is fixed to the shaft 2 to rotate therewith by suitablemeans, such as a clamping screw 91. A pin 92 is fixed in the sleeve 90and projects outwardly "into slot 93 in a cylinder 94, which cylinderloosely encircles the sleeve 90. Thereby the cylinder 9% must rotatewith the sleeve but is longitudinally slidable along the sleeveandtheref'ore along the shaft The cylinder "94 at its bottom endterminates in a horizontal annular flange 95,, and an enlarged cylinder"96 fits about the circular periphery of the flange 95 and is fixedthereto by suitable means, such as pins or screws 97. The cylinder 96 atits bottom end terminates in a fiat circular head 98, beneath which thespring latches 60, mounted on the lids 21 and 22are adapted to engage tolook the lids in closed position. a

Mounted within the cylinder 96 are one or more, preferably'a't'lea'sttwo, centrifugal- 1y operating locking dete'nts. As embodied, a.detent member 100 has a horizontally-extending end 101, adapted to moveinto and out of locking engagement helow'the lower end of the sleeve 90by centrifugal action. This locking member is pivotally'co'nnec'ted at102 upoiifa supporting bracket 103,;extending downwardly from the bottomface of the flange member '95.

Fixed to, or integral with, the locking member 100 is adownwardlyextending tail 104, terminating preferably in a Weight 10 5.When the lids 21 and 22 are closed, their locking latches 60 will snapinto locking position beneath the lower head 98 of the cylinder 96. Assoon as the shaft 2 begins rotating, centrifugal action will move thefingers 101 inwardly immediately into locking engagement beneath thelower end of the sleeve 90. The parts are so proportioned that theveryslowest rotatory motion of shaft .2, due to centrifugal action, willimmediate- 1y cause this locking engagement.

When shaft 2 comes completely to rest,

the fingers 101 are just clear of the botto'ln of the fixed sleeve 90,and the locking device may he slid longitudinally upwardly up along theshaft, the pin sliding in the groove '93." After the lids 21 and 22 arelift ed, the locking device will immediately and automatically againdropto locking position as soon as the operative "lets go thereof. Itwill be understood that these modified forms are likewise illustrativeand explanatory of the invention, and that other forms may be devisedWithin the scope of the appended claims. 7

The present preferred embodiment of cooperating means for preventing thepower being turnedon and the basket started into rotation before thelids are "closed, is shown applied to an ordinarybelt shifter, althoughit will be understood that it is likewise appli cable to other forms ofpower control, such as the starting hoxjfor an electric motor orotherp'ow'er device. 'As' embodied, a rod 112 is longitudinally slidablein a suitable. support, here shownns theweh 113, "which is a part of thebearing support 5 alreaty described, the red being slidable to and froin an aperture or slot 114 in the web.

end into a: at'plate115,-havingin its bottom edge'two locking notches116 and 117, adapted to fit over the flange 113 at the bottom o'f tlreslot 114 to hold the rod 112 firmly in The rod 112 is r'e'ferably formedat its forward embodied form, comprises adevice movable by and with thelids 21'and '22, 'As so embodied, a bail 122is fixed at either end to arod 123, which rod is journaled in lugs 124 and 125, which are mountedon the casing. Rod l23extends outwardly and at its outer end is mountedin a bearing 125. Fixed to this rod is a. crank arm 126, to which ispivoted at its free end 127, a rod 128 terminating at its front end in afiatp'late-129, which,

, likewise is reciprocable in the-slot 114. The plate 129 is providedwith high parts or projections 130 and 131 at its ends with a low part132 therebetween. I

In the operation of this device, the operating rod 112 for the drivingpower for the basket may be regarded asin the power-off position, withthe notch 117 resting over the flange 114, as it was necessary that therod 112 be moved in this position before the locking device on the shaft2 could be moved to permit the raising of the lids 21 or 22. By raisingeither lid, thebail 122 is rocked upwardly, and thereby the crank arm126 is rocked to the left in Fig. 6, and the projection 131 is alined inthe aperture 114, thereby locking the power controlling rod 112 in thepower-off position. These parts must remain in this position so long aseither lid is unclosed.

When both lids 21 and 22 are closed, the

bail 122 drops therewith to the position I shown in Fig. 7, and thebailis sufiiciently heavy to rock the arm 126 tothe right, and thedepression 132 is thereby brought into line with the slot 114. Thispermits the rod 112 to be lifted from the position of Fig, 7 and movedto that of Fig. 8, whenthe recess 116 stops the rod in the power-onposition. While the rod 112 may now be manipulated at will to turn onand off the power, it .will

be recalled that the latches have locked the lids 21 and 22 in'closedposition and they may not be released until the basket and its shaft 2have come to a full stop. If either lid be lifted, the rod 112 isthereby locked in the power-off position. j J

As stated, the foregoing mechanism is shown exemplarily applied to abeltshifter, wherein a driving belt- 134 is driven in a suitab e manner,'as,fromthe counter shaft or otherwise, and isrmovable between the ,fastand'loose pulleys 135 and 136 on shaft 137. Fixed on shaft 137 also is apulley 138 over which runs the basket driving belt 4. Shaft 137 isjournaled in-bearing blocks 139 and 140. A belt shifter141 is attachedto a longitudinally reciprocable rod 142. mounted recinrocably at oneend in, a bearing 143 and.

at its other end144, fixed to the shaft 112.

One of the advantages of my invention is that the operator may turn thebasket freely by hand to facilitate loading and unloading without dangerof having the guard or lid thrown down on his hand, which is adangertherefrom within the scope of the accompanying claims without departingfromthe principles of the invention and without sacrificing its chiefadvantages, j

What I claim is V 1. A safety device for centrifugal machines includingin combination a basket, a closure therefor, meansoperatingautomatically by closing the closure tolock it in closed position, andmeansat the center of the basket movable to permit the unlocking of the:closure onlywhen the basket is at rest and returning automatically toclosure-locking position after its closure-unlocking movement.

2. A safety device for centrifugal machines including in combination abasket, a closure therefor, means operating automaticallyby closing theclosure to lock it in closed position. and means cooperating with theshaftof the basket movable to permit unlockingof the closure only whenthe basket is at rest and returning automatically to locking positionimmediately after such movement, basket rotating means and meanspreventing said means rotating the basket until the closure is closed.

3. A safety device for centrifugal machines including in combination abasket, a closure therefor, inter-engaging means partly on the closureand partly on the basket shaft, operat ng automatically by closing theclosure to lock it in closed position and means preventing the unlockingof the closure until the basket is at rest.

' 4. A safety device for centrifugal machines including in combination abasket. a closure therefor, means operating automatically by closing theclosure to lock it in closed position and means cooperating with. theshaft of the basket movable to permit the unlocking'of the closure onlywhen the basket is at rest, and returning automatically-to lockingposition after said closure is unlocked. basket rotating means and meanscontrolled b the closurefor preventing said means rotating the closureuntil the closure is closed.

-5. A safetv device for centrifugal machines including in combination abasket, a closure therefor, means operating automatically by closing theclosure to lockit in closed position, cooperating means carried partlyby the closure and partly by the'basket shaft preventing the unlockingof said closure until the basket is at rest, said means carried by thebasket shaft being movable to unlock said closure only when the basketis at rest and returning automatically to closure-locking position afterits closure-unlocking-movement, basket rotating means, and meansopcrating to prevent rotation of the basket by said rotating means whenthe closure is not in basket-closing position.

6. A safety device for centrifugal Inachines including in combination abasket and its shaft, a basket closure, a safety device on the shaftnormally in locking position and a locking device on the closureautomatically locking with said safety device by closing the closure.

7. A safety device for centrifugal machines including in combination abasket and its shaft, a basket closure, a safety device on the shaft,movable to unlocking position and returning immediately to lockingposition and a locking device on the closure automatically looking withsaid safety device by closing the closure.

8. A safety device for centrifugal machines includmg in combination abasket and its shaft, a basket closure, a safety device on the shaft,movable to unlocking position and returning automatically andimmediately to locking position and a locking device on the closureautomatically locking with said safety device by closing the. closure.

9. A safety device for centrifugal machines including in combination abasket and its closure, a safety device cooperating with the basketshaft and maintained in locking position by the rotation ofthe basket,but movable to unlock, the closure only when the basket comes to restand returning immedi-- ately to locking position after the closure hasbeen unlocked. preparatory to locking the closure again as soon, as itis closed.

10. A safety device for centrifu al machines including in combination aba ket and its closure, a safety device carried partly b p the closureand partly by the basket shaft and maintained in locking position by therotation of the basket, but movable to unlock the closure only when thebasket comes to rest and returning automatically and immediately tolocking position as soon as said closure has been unlocked preparatoryto locking the closure again as soon as it is closed.

11. A safety device for centrifugal machines including in combination abasket and its shaft, a basket closure, a safety device comprising alocking member slidable along the shaft and means interengagin with theshaft for compelling rotation of the lockin member relatively to theshaft as it slides thercalong, and means on the closure engagin withsaid locking member.

l2. A safety device for centrifugal machines including in combination abasket and its shaft, a basket closure, a locking sleeve slidable alongthe shaft, and having a helical groove therein, and, a pin fixed to theshaft and working in the groove.

13. A safety device for centrifugal. mar chines including in combinationa basket and its: shaft, a basket closure, a locking sleeve slida'blealong the shaft, and having a' helical groovetherein and a pin fixed tothe shaftand working in the groove and a spring latch on the closureengaging automatically with the sleeve.

14, A safety device for centrifugal machines including incombination abasket and its shaft, a basket closure, a locking sleeveslidable alongthe shaft, and havin'g'a helical groove therein and a pin fixed to theshaft and working in the groove anda yielding device on the closureengaging automatically with the sleeve.

15. A safety device for centrifugal machines including in combination abasket and its shaft, a basket closure, a locking sleeve slidable alongthe shaft, and havinga helical groove therein and a pin fixed to theshaft and working in the groove, the roove being formed to cause thepinto loc the sleeve in, looking position. v

16. A safety device for centrifugal machines including in combination abasket and its shaft, a basket closure, a locking sleeve slidable alongthe shaft, and having ahelical groove therein and a pin fixed to theshaft and worl'iing in thegroove, the groove being formed at one endthereof-to cause the pin to lock the sleeve in locking position. i

1?. A safety device for centrifugal ma chines including combination abasket, a closure therefor, means operating automatically by closing theclosure to lock it in closed position, means cooperating with the basketshaft for preventing the unlocking of the closure until the basket is atrest, and movable to unlock said closure only when the basket y is atrest and returning immediately after such movement to closure-lockingposition and means, preventing the application of power to the basketuntil the closure is closed.

18. A safety device for centrifugal machines including in combination abasket, a closure therefor, means operating automatically by closing theclosure to lock it in closed position, means carried partly by theclosure and partly by the basket shaft for preventing the unlocking ofthe closure until the basket is at rest, and movable to unlock saidclosure only when the basket is at rest and returning immediately aftersuch movement to closure? locking position and means preventing the gapplication of power to the basket until the closure is closed, but notinterfering with the rotation of the basket manually by an operative.

19. A, centrifugal, machine including in combination a basket and shaft,a basket closure, Safety closure means comprising a device on the shaftnormally in locking position and movable to unlocking position. byrota-- tion relatively to the shaft in'the direction. of rotation of theshaft.

20.. A centrifugal machinev including in combination a basket and shaft,a basket clo-' sure, a safety closure means comprising a device on theshaft, movable to unlockingposi tion b rotation relatively to the shaftin the direction of rotation of the shaft.

' 21. A centrifugal machine including in combination a basket. andshaft, a basket closure, safety closure means comprising a device on theshaftand movable to unlocking 6 position by rotation relatively'to theshaft in thedirection of rotation of the shaft, and a device on theclosure automatically interlocking with said device on the shaft.

, 22. A centrifugal machine including in combination a basket and shaft,a basket closure, safety closure means comprising. a device on the shaftnormally in locking position and movable to unlocking position by ro- Vtationrelatively to the shaft in the direction 3 locked.

of rotation of the shaft, a device on the closure automaticallyinterlocking with said device on the shaft, and means operable to startthe machine only after said devices are inter- 23. A centrifugalextractor including in combination a basket, a driving shaft, a basketcover, locking means for the cover including a member driven by theshaft and a member controlled bythe cover, the coverbeing unlocked byrotating one of said members relatively to theshaftand in the samedirection as the shaft drives, and means for preventing the basketstarting until the cover is locked.

' 24. A centrifugal extractorincluding in combination a basket, adriving shaft, a basket cover, locking means for, the cover including amember rotating with the shaft and a a member controlled by the cover,the cover being unlocked by rotating, said rotating member relatively tothe shaft and in the same directionas the shaft drives, and means forpreventing the basket starting until the cover is locked.

25. A centrifugal extractor including in combination a basket, adrivingshaft-,a basket cover, locking. means for the cover including a memberrotating with the shaft and a movable longitudinally thereof and amember controlled by the cover, the cover being unlocked by rotatingsaid rotating memberrelatively to the shaftvand in the direction inwhich the shaft drives to move it longitudi- I nally of the shaft, andmeans for preventing the basket starting until the cover is locked.

26. 'A centrifugal extractor including in combination a basket, adriving shaft, a safety cover, a safety lock including a member movablewith the cover and a member concentric with and rotating with the shaftand being rotatable in the same direction relativelyftheretoandcontrolling said first mentioned movable member.

27. A centrifugal extractor including in combination a basket, a drivingshaft, a

ideal;

safety cover, a safety lock including amember movable with the cover anda. member mounted upon and longitudinally movable 011 and rotating withthe shaft and being rotatable in the same direction relatively theretoand controll ng said first mentioned movable member.

28. A centrifugal extractor including in combination a basket, a drivingshaft, a safety cover, a safety lock including a'mem ber movable withthe cover and a member ro-. tating with the shaft and longitudinallymovable thereon and being rotatable in the same direction relativelythereto for preventing the opening of the cover as long as the shaftcontinues to rotate.

29. A centrifugal extractor including in combination a basket, a drivingshaft, a safety cover, a safety lock including a member movable with thecover and a member mounted upon concentric with and longitudinallymovable on the shaft and rotating with itand' being rotatable in thesame directionrelati'vely thereto and controlling said i first mentionedmovable'member. Y

30. A centrifugal extractor including in combination a basket, a drivingshaft, a saIety cover, a safety lock including a member movable with thecover and a member rotating with the shaft and being rotatable in thesame direction relatively thereto to pass out of the path of saidfirst-mentioned member.

31. A centrifugal extractorincluding in combination a basket, a drivingshaft, :1 safety cover, a safety lock including a member movable withthe cover and a member mounted upon and rotating with the shaft andbeing rotatable in thesame direction relatively thereto to pass outofthe path of said first mentioned member. f

32. A centrifugal extractor including in combination a' basket, adriving shaft, a

safety cover, a safety lock including a member movable with the coverand a member rotating with the cover and a member rotating with theshaft and being rotatable in the same direction relatively thereto andcontrolling said first-mentioned movable member, and means forpreventing starting'of the shaft while the cover is open. 7

33. A centrifugal extractor including in combination a basket, a drivingshaft, a.

safety cover, a safety lock including a member movable with the coverand a member ro-. tating with the shaft and being rotatable in the samedirection relatively thereto and controlling said first-mentionedmovable member, and means cooperating with one of said members forpreventing starting of the shaft while the cover is open. I

34. A centrifgual extractor including in combination a basket, a drivingshaft, a

safety cover, a safet lock including a member movable with t e cover anda member mounted upon and rotating with the shaft and being rotatable inthe same direction relatively thereto and controlling said firstmentioned movable member, and means for preventing starting of the shaftWhile the cover 1s open.

35. A centrifugal extractor includin in combination a basket, a drivingshaft, a safety cover, a safety lock including a mem- 10 her movableWith the cover and a member mounted upon and rotating With the shaft andbeing rotatable in the same direction relatively thereto and controllingsaid first-mention-ed movable member and means cooperating with one ofsaid members for preventing starting of the shaft While the cover isopen.

36. In combination with a centrlfugal machine, a driving shaft, alocking sleeve, means, including a key and a diagonal slot,

for positioning the sleeve on the shaft, and

a locking member movable with the cover of the centrifugal, thelockingsleeve being engageable with the locking member for preventingthe opening of the cover while the shaft and the basket of thecentrifugal ma.- chine are rotating.

In testimony whereof, I have signed my name to this specification.

TANDY A. BRYSON.

